A: with minor lip
Car Oil Seal Types and Applications

Type code
Cold rolled carbon steel sheet
(JIS* SPCC)

a7tc spark plug. With a simple screw-on design, most motorbike owners can replace their spark plugs in just a few minutes, without the need for specialized tools or professional help.
Lever the seal out with a screwdriver, working carefully to avoid scoring the seal housing.
Oil seals are available in an immense range of sizes, for shafts from a few millimetres to several metres. Once the shaft diameter, groove diameter (housing diameter) and groove width are known, selecting an appropriate oil seal is a simple task. An oil seal or its product description is usually associated with three dimensions, for example 6x15x4. These refer to the sizes of the hardware for which the oil seal is designed. In this example, this oil seal is suitable for: 6-mm shaft diameter x 15-mm groove diameter x 4-mm minimum groove width.

High mileage oil is specifically designed for cars with more than 75,000 miles. This type of oil can help reduce oil consumption, minimize leaks and oil seepage, and can also help reduce smoke and emissions in older engines.